Ungermann-Bass Inc. — 17 prefixes (MA-L)

Ungermann-Bass, Inc. (also known as "UB" or "UB Networks") was a pioneering enterprise networking company founded in Santa Clara, California in 1979 by Ralph Ungermann and Charlie Bass — described by multiple independent histories as the first large networking company independent of any computer manufacturer. All 17 IEEE MA-L (24-bit) OUI blocks in the local registry mirror register to the same entity, "UNGERMANN-BASS INC.," at 3900 Freedom Circle, Santa Clara, CA 95054 — a single consistent registered address across every block, with no MA-M/MA-S assignments found. This is a company with clear, well-documented substance, not a bare single-OUI registration: it went public in 1983, was acquired by Tandem Computers in 1988, and was sold by Tandem to Newbridge Networks in 1997, after which Newbridge closed the Santa Clara operation (Newbridge was later folded into Alcatel). Products under the UB/Ungermann-Bass brand included the flagship Net/One multi-vendor networking system (originally XNS-based, later TCP/IP), the AccessOne line (StarLAN and 10BASE-T), 10BROAD36 broadband Ethernet gear, and standalone Ethernet transceivers and NICs — device types corroborated by surviving hardware listed on retro-computing and parts sites (e.g., the ASP320 10BASE-T-to-AUI transceiver, the 5210A Ethernet V2 transceiver, and ISA-bus twisted-pair Ethernet adapter cards). No CVEs or security advisories filed under the "Ungermann-Bass" or "UB" brand were found in this pass — plausible given the company ceased operating under that name in 1997, well before the CVE system's modern era.

IEEE assignment

17 prefixes → UNGERMANN-BASS INC. (MA-L only; single registered entity across all 17 rows) [Confirmed] — the IEEE MA-L registry

HQ / registered address

3900 Freedom Circle, Santa Clara, CA 95054, US — identical across all 17 blocks (no outlier addresses) [Confirmed] — the IEEE MA-L registry

Company status / substance

defunct as an independent brand — founded 1979 (Ralph Ungermann + Charlie Bass), IPO 1983, acquired by Tandem Computers 1988, sold to Newbridge Networks 1997 (Newbridge subsequently closed the Santa Clara site and laid off most staff), Newbridge later absorbed into Alcatel

[Confirmed] — https://en.wikipedia.org/wiki/Ungermann-Bass, https://historyofcomputercommunications.info/section/c.4/Ungermann-Bass/

Device types

enterprise Ethernet networking hardware — Net/One multi-vendor network system (XNS, later TCP/IP), AccessOne (StarLAN/10BASE-T), 10BROAD36 broadband Ethernet, standalone transceivers (10BASE-T TPAU, Ethernet V2 AUI), ISA twisted-pair NICs [Confirmed] — https://en.wikipedia.org/wiki/Ungermann-Bass, https://www.elite.parts/manufacturers/ungermann-bass, https://theretroweb.com/expansioncards/5529

Verified device corroboration (surviving hardware listings, third-party)

ASP320 10BASE-T TPAU-to-AUI transceiver; 5210A 12VDC Ethernet V2 network transceiver; ISA twisted-pair Ethernet adapter (31833-02) [Likely] — https://dreamhardware.com/product/ungermann-bass-inc-asp320-10base-t-tpau-twisted-pair-to-aui-transceiver/, https://www.dougdeals.com/box-of-5-new-ungermann-bass-5210a-12vdc-500ma-ethernet-v2-network-transceivers/, https://www.ebay.com/itm/141983036150

Historical note

one of the first vendors to ship Ethernet-over-twisted-pair equipment; engineering group in Andover, MA credited with an early (1992) Virtual Private Network implementation; VP of engineering John Davidson co-created NCP, ARPANET's pre-TCP transport protocol; UB reportedly assisted Apple (MacTCP) and Microsoft (Winsock-compatible stacks) in the late 1980s [Likely] — https://en.wikipedia.org/wiki/Ungermann-Bass, https://historyofcomputercommunications.info/section/9.11/Ralph-Ungermann-and-Charlie-Bass-and-the-Founding-of-Ungermann-Bass/

Security context

no CVEs or vendor security advisories found filed under "Ungermann-Bass" or "UB" in this research pass; plausible given the brand ceased independent operation in 1997, before the modern CVE era [Unknown] — not found in this pass

Dates

the local IEEE registry mirror (the IEEE MA-L registry) has NO date/assignment-date column at all — this holds for every OUI row, not just Ungermann-Bass's 17. No registration date is recorded here. Any third-party "date registered" for one of these MAC prefixes (e.g., a maclookup/manuf-style scrape) is a database artifact, not an IEEE fact

[Confirmed] — the IEEE MA-L registry

Verified prefix sample

00:DD:00, 00:DD:0E, 00:BB:F0 (all 17 blocks share the 00:DD:0x range plus one 00:BB:F0 outlier prefix) [Confirmed] — the IEEE MA-L registry